Dental drill



(No Model.)

3 Sheets- Sheet 1. A. BETTER. DENTAL DRILL.

Patented Mar. 11, 1890.

Law; LE JLFLW WMMM I L l NY PETERS, Phowuma m hm msmngmu, D C.

3 SheetsSheet 2. A. BETTER. DENTAL DRILL.

(NoModeL) No. 423,344. PatentedMar. 11, 1890.

N. PETERS FhoioLilhagrnpher. wnsmn wn, D. c.

(No Model.) 3 Sheets-Sheet 3. A. BETTER.

DENTAL DRILL.

0. 423,344. Patented Mar. 11, 1890.

X2451: EEEEZE Ii Q 14' a UNITED STATES PATENT OFFICE.

ARWVED BETTER, OF UTICA, NEWV YORK.

DENTAL DRILL.

SPECIFICATION forming part of Letters Patent No. 423,344, dated March11, 1890.

Application filed July 10, 1889. $erial No. 317,023. (No model.)

To all whom zit may concern.-

Be it known that I, ARWED BETTER, a citizen of the United States,residing at Utica, county of Oneida, State of New York, have inventedcertain new and useful Improvements in Dental Drills, of which the.following is a specification.

My invention relates to various improvements in several parts of adental engine, whereby they are made to co-operate in a more economicaland satisfactory manner than is the case with devices of the kind now inthe market.

My invention consists, first, in an improved form of base or footconstructedsubstantially as hereinafter described and provided on itsunder side with a rubber undersole or pad extending over the whole undersurface of the supporting base or foot, the object being to provide acushioning device for the engine, and thus greatly improve its workingcapacity by dispensing with all shock when the upright or standard swaysor tilts. Ialso provide in this connection a second cushioning deviceset into the base from the upper side, on which rests the electric motorfor driving the drill, this cushioning device consisting of a piece ofwoolen or other cloth of the requisite thickness surmounted by a plateof rubber similar to that employed on the lower surface of the base.This cushioning device serves to counteract any pounding movement of themotor;

My invention also consists in the connect ing and disconnecting devicesbetween the shaft and power-receiving pulley and the flexible shaft ofthe drill, the object of this part of my invention being to provide asimple and durable construction thoroughly efficient when the engine isin operation and which may be easily disconnected when desired.

My invention consists in other-details hereinafter more particularlydescribed, and

pointed out in the claims.

Referring to the accompanyingdrawings, which form apart of thisspecification, Figure 1 is a perspective view of my improved dentalengine. Fig. 2 is a perspective view, to a larger scale, of certaindetailsa Fig. 3 is a side elevation partly in section. In this view Ihave broken the standard to bring the upper and lower portions of theengine nearer together. Fig. 4: is a cross-section of themotor-containing box. Fig. 5 is a top view of the base or foot. Fig. 6is a top view of the tripod. Figs. 7 and 8 are detail views.

In the drawings 1, represents a base or foot for supporting the engine,provided on its under side with a rubber cushion 2, fastened 0r securedto the base by gluing or in any other suitable manner.

A standard 3, supported upon the legs 4, which branch outwardly anddownwardly therefrom, supports the dental apparatus or engine at itsupper end, as shown in Figs. 1, 2, and 3. The standard 3 is connected tothe legs or-tripod 4 in the manner shown in Fig. 3, the standard beingprovided with a male screw 5, which fits into the female screw 6 of thetripod. The legs or tripod i extend outwardly and downwardly, asaforesaid, and are attached to the base 01' foot 1 by means of hooks orlatches 7, which are adapted to interlock with the legs and which aresupported 011 suitable projections or shoulders 8, secured to theaforesaid base or foot. The legs also extend into the base or foot, thelatter being provided with openings 9 for the reception thereof.

At 10, I provide a square hole instead of a round hole, as shown in theother places, for the better securing andlocking of the parts together.This construction is shown in Fig. 5 of the drawings.

The motor which I employ in operating my dental engine is shown at 11.It rests upon a cushioning device set within the base. This cushioningdevice is composed of the rubber'shiel'd 12, mounted upon the woolen orother flexible shield 13, the two shields, one above the other, beinglocated in acavity corresponding in size to the cushioning devices andbeing located in the upper surface of the.

them. The balance of the casing is shown at 18, and at 19, I provide ahandle for removing the same. The casing 18 is provided with slots 20,which are adapted to fit over the projecting portions of the tracks 15,so that the operator can by taking hold of the casing at 19 draw it offor thrust it on at will. It is shown in place in Fig. 3. Extendingthrough the end 17 of the casing is a shaft 21 of the motor, and uponthe end of this shaft is located a power-transmitting pulley 22. It willbe seen by referring to the drawings, more particularly Figs 1, 3, and5, that the motor is placed in between the legs of the tripod and thepower-transmitting pulley occupies a central position relatively to thesuperim- 1 posed standard 3. The said standard 3 is provided with anextension 23, which is screwed 5 onto the lower portion at 24. The upperpart of the extension 23 is provided with a, shoulder at 25 and a secondex ension 26, as;

shown in Figs. 2 and 3.

27, and is provided with a sleeve 28, which fits over the extension 26.cally adjustable upon the upright, and is se- The bracket is verti- Icured in any desired position by means of the sliding sleeve 29,provided with a set-screw 30.

Normally the adjusting-sleeve 29 rests upon the shoulder 25 and thebracket-sleeve 28 upon the top of the sleeve 29; but for the purposes;hereinafter described it is desired at times to adjust these parts, andfor these purposes the bracket 27 can be raised or lowered and ad-; justed vertically and in any desired horizon-' tal plane by means of theaforesaid sliding sleeve 29 and set-screw 30. Alocking thumbscrew 31 isalso provided for locking the bracket, in position and preventing itfrom swinging after it has been set in the desired 1 place. A spindle32, extending downwardly from the yoke-support 33, enters the bracket-1sleeve 28 and extension 26 and serves as an axis about which the yoke 33and its sup-' ported mechanism may be swung. The spin-' dle 32 isprovided with acap 34, which rests' normally upon the top of thebracket-sleeve. 28 when the partsare in position and which has anupwardly-extending" yoke or forked, bearing for a horizontal swing-shaft35. In-@ closing this shaft is a sleeve 36,which extends from the yoke33 to the yoke 37. It is supported at its ends in said yokes.

The powerreceiving pulley is shown at 38, and it is connected by theshaft 35 with a pulley 39, supported and j ournaled in the yoke 37, andwhich 1 will be hereinafter referred to.

The shaft 35 i is. made hollow at its outer end 40, andis adapted toreceive the finger 41, which-forms the inner terminus of the flexibleshaft 42.

A chamber 41 in this finger is provided witha spring-button 44, (shownin detail in Fig. 7,)

end of the said shaft.

This slot is shown in- Fig.2. The automatically=operating lockingbuttonconsists of a stud 44, extending above a spindle 55 of a fan 56. Themain 'supportingbracket is shown at the surface of the finger 41 andhaving at 45 an annular collar "which seats upon a spring 46, whichspring keeps the stud 44 normally in an elevated position and preventsthe parts from being detached, but which can be readily pressed down,thus providing for the easy removal and disconnecting of the parts whenit is desired. The button 44 is confinedwithin a chamber 41 by a washer49. An opening 48 in said chamber receives the stud 44 when the buttonis thrust down. The washer 49 can of course be removed when it isdesired to repair the button.

A supplementary bracket 50 is attached by means of screws or otherwiseat a point 51 to the bracket 27 and extends outwardly and upwardly, andis provided at its upper end with a'yoke 52. In this yoke is suspended apulley 53, said pulley being mounted on a horizontal shaft extendingthrough the yoke. This shaft is hollow and is adapted to receive The fancan be adjusted to any desired position by means. of the thumb-screw 57.A band 58 connects pulleys 39 and 53 together, whereby motion iscommunicated from the working-shaft to the fan. The supplementarybracket 50, being supported on the main bracket 27, will swing in thesame horizontal are as that.described by the main bracket, and themovement of one will cause a corresponding movement in a the other, asthey both center from the same I point, and 'the fan-shaft, with its fanmounted thereon, will be turned and will swing therewith, whereby acooling-current of air may be directed from any desired angle upon thepatient. j

At 66, I show a-grind'ing'or polishing wheel mounted upon a shaft'60,the latter being an extension of the shaft 35 and. being locked thereto,by means of the thumb-screw 61. At

62, I show a smaller "bracket supported by means of adownwardly-extending finger 63 or sliding stem in a socket 64,which'pro'jec'ts from the bracket-sleeve 28. This finger is square andthe corresponding opening in the socket 64 is similarly constructed, inorder to hold the bracket 62 rigidly in place.

Upon-the outer end of the bracket 62, I

IIO

mount a cross-piece 65, which holds the slid the motor being inclosed ina casing having a non-conducting lining 71, it will be seen that thereis no possibility of an electric current being communicated to theupright standard, to the brackets 27 36, or to any other parts of theengine proper.

Having thus described my invention, the following is what I claim as newtherein and desire to secure by Letters Patent:

1. The combination of a dental drill, substantially as hereinbeforeshown and described, with a supporting-standard and a base or foothaving a rubber or other cushioning device 011 its lower surface.

2. In combination with a dental drill, substantially as hereinbeforeshown and described, a Vertical supporting-standard, a base or foot towhich the standard is attached, and an electric motor for operating theengine, said motor resting on the base and provided with intermediatecushioning devices, sub stantially as and for the purposes set forth.

3. In combination with a dental drill,' a standard for supporting thesame, a base or foot upon which the standard rests, an electric motorconnected to the engine, the cushioning devices 12 and 13, andlocking-screws 14, for locking the motor to the aforesaid base or foot,substantially as set forth.

4. In combination with a dental drill, sub= stantially as hereinbeforeshown and de scribed, a vertical standard for supporting the same, atripod, a base or foot upon which the tripod rests and to which it isattached, and a motor resting on the base and located be tween the legsof the tripod and provided with an inclosing box or case having aremovable cover.

5. The combination, in a dental drill, of

the power receiving pulley supported, as described, upon thehorizontally swinging bracket, with a supplementary bracket supporting afan and adapted to be operated by means of the electric motor andarranged to swing with the main bracket, as and for the purposes setforth.

6. The combinatiominadentaldrill,substantially as hereinbefore shown anddescribed, of the bracket 27, supplementary bracket 50 at right anglesthereto, a power-receiving pulley 38, the horizontal shaft 35, thepulley 39, mounted thereon and connected by means of band 58 to thepulley 53, the shafts 54 55, and the fan 56, all adapted to operate substantially as and for the purposes set forth.

7. In a dental drill, the-combination of the horizontal shaft 35, havinghollow terminus at the outer end and a slot 43 in one side thereof, andthe flexible shaft 42, having a finger 41, provided with an automaticlocking-button which interlocks with the shaft by means of the slot 43.

8. In a dental drill, the combination of the main horizontaloperating-shaft 35, provided with an extension 60, grinding-wheel 59, atool-holding bracket 67, and a shield or guard 68, the parts beingoperated and being adj ustable as and for the purposes set forth.

' ARWVED BETTER.

Witnesses:

IRA W. PARRY, JOHN H. HOLLINGWOR'IH.

